Ah, thanks for the info, Hadrien. Too bad, that they don't have support for folders and zipped images yet, as I want to read manga on the Cybook too. But I can convert the manga to PDF for the time being, so it's not that bad (as long as they add support later).

They decided to work on PDF first rather than zipped images, that's why PDF is available for the launch. Once it's ready, I guess they'll be working on zipped images once again.